Elevator safety attachment.



J. JACKSON.

.TOR SAFETY ATTACHMENT.

TION FILED SEPT. 16, 19l5.

EL V

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Patented Dec. 5,1916.

2 SHEETS-SHEET 2.

awuzmtoz ywdm JAMES JACKSON, OF GREGOIRY, MICHIGAN.

ELEVATOR SAFETY ATTACHMENT.

Specification of Letters Patent.

Patented Dec. 5, 191?.

Application filed September 16, 1915. Serial N 0. 51,033.

To all whom it may concern:

Be it known that I, JAMES JACKSON, a citizen of the United States,residing at Gregory, in the county of Livingston and State of Michigan,have invented certain new and useful Improvements in Elevator SafetyAttachments, of which the following is a specification.

My invention relates to the class of elevators, and more particularly toa safety appliance for preventing an elevator cage from dropping owingto the breaking of the suspending cable.

The primary object of my invention is to provide a safety device of theabove character which is simple in construction, cheap to manufacture,strong and durable, and of fective in operation.

Another object of my invention is to provide a safety device of theclass above mentioned which may be applied to any of the existing typesof elevators without altering the control mechanism of the elevator inany degree.

A further obj ect of the invention is to provide a safety device forelevators which will quickly and positively engage the guides of thecage to prevent said cage from dropping.

With the above and other objects in view my invention resides preferablyin the construction, combination, and arrangement of parts ashereinafter set forth in the specification and illustrated in theaccompanying drawings, in which Figure 1 is a vertical sectional viewtaken through an elevator shaft and cage showing my invention appliedthereto and in unlocked position. Fig. 2 is a similar view showing theinvention in a locked position. Fig. 3 is a similar view taken on aplane at right angles to the plane on which Figs. 1 and 2 are taken.

Similar reference characters indicate similar parts throughout thevarious views of the drawings.

In the drawings, wherein the preferred embodiment of my invention isillustrated, an elevator shaft is shown and designated 1. The walls ofsaid shaft having the usual guides 2 thereon, said guides having wearingplates 3 on their outer faces. Screws 4 or the like serve to secure saidplates and guides in position. The guides and plates are apertured asindicated at 5 for a purpose which will hereinafter appear. An elevatorcage is desieted 6 and is provided with a top wall 7 having a transversebeam 8 disposed thereon for a purpose which will hereinafter appear.

The device of my invention includes broadly a plurality of lockingmembers for engagement in certain of the apertures 5, an operating frametherefor, and means for actuating said operating frame. The lockmgmembers include a plurality of slidably mounted oppositely movable bars9 and 10, said bars being supported in guides 11 and 12, respectively,carried by the beam 8. The top wall 7 of the cage 6 may also serve as anadditional guide for the bars 9 and 10. On the inner adjacentextremities of the bars 9 and 10 are disposed transverse pins 13 and 14,said pins being connected by a coil spring or the like 15 serving tomaintain the bars in the position shown in Fig. 1.

The operating means of my invention includes a frame 7 having sides 16and 17. The sides 16 and 17 are supported in spaced relation by means ofblocks 18 disposed at desired points throughout the height of the frame.Suitable ribs 19 are provided on the sides 16 and 17 to assist inretaining the blocks in position, securing bolts 20 passing through saidsides and beneath said blocks, whereby to maintain a rigidstructure. Asshown to advantage in Fig. 3 the frame embraces the beam S, said beamhaving guiding recesses 21 out in the opposite faces thereof toaccommodate the sides 16 and 17 of said frame. A web plate 22 extendstransversely of the frame and between the sides thereof, and is providedwith a plurality of projections 23 for engagement in suitable openingsin said sides. The web plate is provided with an aperture 24 in which aring 25 may be received, said ring having connection with a hook 26carried by the lower extremity of the supporting cable or the like 27. Aplurality of bolts 28 are disposed in the sides 16 and 17 adjacent saidWeb plate so as to prevent flexing of the plates under load, which wouldbe undesirable.

On the inner faces of the sides 16 I have provided a plurality ofsubstantially V- shaped cams 29 and 30, said cams engaging the oppositeextremities of the transverse pins 13 and 14 hereinafter appear. Thecams project into engagement with said pins and also snugly engage thebeam 8 so that the movement of the frame relative said beam will be evenand free of lateral lost motion.

for a purpose which will details thereof that The actuating means of myinvention includes a plurality of coil spring elementsor the like 31 and82 having their adjacent eX- tremities connected at 33 to the-web plate22 and their opposite extremities connected at 3% and 35 to the beam 8.The springs are of the contractile type and exert a downward pull on theframe which is counteracted by the weight of the cage as long as thecable 27 remains intact.

The operation of my invention is as follows: Under normal conditions theframe, which is vertically slidable relative to said beam 8 is in theposition shown in Fig. 1. The weight of the cage 6 exerts a downwardpull on the springs 31 and 32 which in turn exert a similar pull on theframe F, but owing to the fact that the cable 27 is normally intact, theaction of the cage. and springs is neutralized. However, should thecable break or suddenly become free allowing the cage to drop rapidlythe springs will be allowed to exert their force on the frame, movingthe same from the position in Fig. 1 vertically into the position shownin Fig. 2. The inclined faces of the \l-shaped cams 29 and 30 willengage the free extremities of the pins 18 and 1a causing theirseparation and thereby forcing the bars 9 and 10' into engagement withcertain of the aperturesy5 in the guides 2. This will effectively checkthe further descent of the cage. It is desired that it be understoodthat the peculiar form of beam shown in my invention may be altered tosuit the'co-ndit'ion existingin different types of elevators, and thatthe frame may also be altered for this purpose, it, of course, beingunderstood that the changes are within the scope of the invention asclaimed.

While I have shown and described" my invention as possessing a peculiarform and construction, it is desired that it be understood that 1 maymake such changes in the do not depart from the spirit and scope of theinvention as claimed; Having thus described'my invention what I claimand desire to secure by Letters Patent is:

1. A; safety attachment for elevators, including a plurality oflaterally slidable lock- Copies of this patent may be obtained for fivecents each. by addressing the ing bars, a frame comprising spaced sidemembers, operating means connected with said frame, and cams carriedupon said side members and engageable with said bars whereby the samewill be moved to locking positions upon failure of the cable.

2. A safety attachment for elevators, including a plurality of laterallyslidable yieldably connected locking bars, said bars, a frame comprisingspaced side members, spacing. means. therefor, spring actuating meansconnected with said frame, and earns carried upon said sides and en:

gageable with said pins to move said bars to locking position.

3. A safety attachment for elevators, including, in combination with. anelevator shaft having apertured guides therein and a cage, laterallyslidable engagement in said apertured guides means for normallymaintaining said bars in retracted positions, a frame comprising spacedside. members, spacing means therefor,

spring actuated means connected with said frame, and cams carried uponsaid side members and engageable with saidlocking bars whereby to movethe same to locking positions upon failure of the cable.

45..A safety attachment for elevators, cluding, in combination with anelevator shaft having apertured guides therein and a cage,a plurality oflaterally slidable'yield ably connected lockingbars carried by the cage,pins onisaid bars, a frame comprising 8 5 spaced side members arrangedupon said cage and movable with relatlon thereto, spacing meanstherefor, a top bar secured to said side members to facilitateconnection with a cable, spring actuating means connected'to' said, topbar and said cage for movingthe'frame and sides, and cams carrie uponsaid side members engageable with said pins to move the locking barsinto engagement with the apertured guides upon failure ofthe cable.

In testimony whereof I'aflix my signature in presenceoftwo witnesses. vJAM-ES JACKSON.

\Vitnesses PAUL C. PANOER, E. B. Os'rRANDER.

Commissioner of" Patents,

Washington, D. 0.

pins on 60 looking bars for 70 inso

